Soy sauce is the foundation of Chinese and other Asian cooking, so you really want to get the right type. You should search or read the label before you purchase any soy sauce. The main ingredients include soybeans, wheat, water, salt and so on. Some flavor enhanced soy sauces also contain syrup and alcohol.
In China, we often use light soy sauce, which has a lighter color than regular soy sauce and it tastes saltier. We pair it with dark soy sauce to add color to a dish, if necessary. if you don’t want too many bottles in your cupboard, you can get regular soy sauce instead. It creates very authentic Chinese food. The dish may be a bit lighter in color than you hoped, but it won’t taste any different.